the.com/strain

the body's polite scream right before it files a formal complaint

means To stretch, push, or work something (or yourself) so hard that it bends, tears, or aches under the pressure — or the tension and injury that results.

from From Old French 'estreindre,' to bind or squeeze tight, which goes back to Latin 'stringere' — to draw tight, bind, or press. That same Latin root tightens its grip across English: it's a cousin of 'stringent,' 'strict,' and 'constrain,' all words about things pulled taut to the point of complaint. The 'lineage' sense of strain — as in a strain of bacteria or a noble strain — is a separate thread entirely, from Old English 'strēon' meaning 'gain' or 'begetting,' which only later got tangled up with this one.

plural meaning
means stress, music passages, and bacterial lineages
old roots
once meant bloodline, as in noble strain
viral fame
flu and COVID strains get yearly named editions
engineering
strain is deformation, stress is the force causing it
for instance

influenza h5n1 — avian flu strain causing human deaths since 1997, ongoing pandemic risk in poultry

mrsa usa300 — methicillin-resistant staphylococcus aureus strain responsible for majority of us staph infections

wheat bolero — drought-resistant strain developed in mexico in the 1960s, foundation of green revolution

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